Musical instrument.



J. J. DOLL.

MUSICAL INSTRUMENT.

APPLICATION FILED APR. 1. l9l3.

1,299, 146. Patented Apr. 1,191.9.

JOHN J. DOLL, OF NEW YORK, N. Y.

MUSICAL INSTRUMENT.

Specification of Letters Patent.

Patented Apr. 1, 1919.

Application filed April 1, 1913. Serial No. 758,147.

To all whom it may concern:

Be it known that I, JOHN J. DoLL, a citi zen of the United States,residing at the borough of Manhattan, in the county of New York andState of New York, have invented certain new and' useful Improvements inMusical Instruments, of which the following is a specification,reference being had therein. to the accompanying drawing.

My invention relates to improvements in the operating mechanism for themusic spools for player pianos, and has particular reference to means incombination with the take-up spool whereby the speed of the same isgradually decreased as the perforated music sheet is wound thereupon soas to maintain constant the speed of movement of the perforated sheetwith reference to the tracker bar.

Referring to the accompanying drawings, I have illustrated in Figure 1in front elevation, the pneumatic motor and the music spools andconnections for operating the same. Fig. 2 is a view looking from rightto left at Fig. 1, and Fig. 3 is an enlarged perspective View showingpart of the automatic regulating mechanism by which the speed of thetake-up roll is gradually de creased as the perforated sheet is woundthereupon.

4 indicates the music spool from which the perforated sheet is woundupon the spool 5. 6 indicates the ear upon the end of the spool 5adapted to be engaged by the pinion 7 upon the shaft 8 which is adaptedto be rotated by the sprocket 9, carrying the chain 10, which alsopasses over the sprocket 11 upon the shaft 12 of the loaded spool 4. 13indicates another sprocket upon the shaft 8 provided with the sprocketchain 14 which also passes over the sprocket 15 upon the crank shaft 16of the pneumatic motor 17. From this it will be seen that when thepneumatic motor 17 is in operation power is transmitted through thecrank shaft 16, sprocket 15, chain 14L, sprocket 13, and shaft 8 intothe sprocket 9 which rotates freely with the shaft 8 carrying the pinion7 until the coupling 19 is thrown leftwardly by the levers 20-21connected to the pneumatic 22 which is under the control of theoperator. When the coupling 19 is thrown leftwardly, it shifts the shaft8 and its pinion 7 leftwardly until said pinion engages the gear 6thereby causing the take-up spool to revolve. As the said spool revolveswinding upon itself the perforated sheet 18, the diameter of the sameincreases, causing the roller 22 upon the bar 23 which said roller ridesupon the surface of the same as shown, to rotate the said bar 23 uponits bearing 23, liftingthe crank 24 thereof, having the extension arm 25suitably connected to the rod 26, attached to the slide 27 therebyraising the said slide gradually as the music is wound upon the saidtake-up roll 5.

The flow of air controlling the pneumatic motor 17 is controlled throughthe passage 28 which in turn is controlled by the slide 27 s0 that asthe slide 27 is raised the speed of the pneumatic motor 17 is graduallydecreased and the speed of revolution of the music roll 5 isproportionately decreased with the increase in its diameter, thusinsuring a constant speed of travel of the said perforated music sheetacross the said tracker bar 29.

When it is desired to rewind the perforated sheet 18 upon the roll 4: itis only necessary for the operator to again operate the pneumatic 22 sothat the lever 21 is thrown leftwardly, thereby causing the connectinglever 20 and coupling 19 to disconnect the pinion 7 from the gear 6 andallowing said coupling 19 to become engaged with the sprocket wheel 9 bywhich the power is transmitted to the sprocket wheel 11 by the chain 10,thus causing the music roll 1 to rewind upon itself the said perforatedsheet 18.

The spring 31 attached to the casing 32 within which the slide 27 ismounted is connected at its other extremity to the crank 24 of the bar23 thereby maintaining the roller 22 with slight tension always upon theface of the perforated roll of music, so that it will be seen that asthe perforated sheet is wound back on to the roll 4 from the roll 5, theautomatic control roller 22 will follow back to its original positionupon the core of the take-up spool 5.

33 is a valve pivoted by the pin 34: at the back of the casing 32adapted to rest against the end of the screw 35, passing through thehole of the casing and being maintained in said position by suitableresilient means such as the spring 36. From this it will be seen that asthe screw 35 is turned, the amount of the opening 28 may be reduced orenlarged observed that the ends of the opening 28 are V-shaped eXceptthat they are preferably curved as shown as it has been found that thebest results are obtained by this form of opening.

Of course it will be understood that various modifications may be madewithout departing from the spirit of the invention as claimed.

I claim:

In an apparatus of the class described, a music spool and a take-uproll, a pneumatic motor and transmission therebtween, an air ductsupplying air to said motor and a valve in said air duct, a U-shaped barhaving one leg connected to said valve and the other 15 leg providedwith a roller adapted to bear upon the face of said take-up roll wherebyas said take-up roll fills, said valve reduces the supply of air to saidmotor.

In testimony whereof I affix my signature 20 in presenceof twowitnesses.

JOHN J. DOLL.

Witnesses LQUISE ENDERLE, THOMAS A. HILL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, WashingtonyD. G.

